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Chem 6B

# Chem 6B - component must be calculated first hexane 1...

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8.72 (a) To determine the vapor pressure of the solution, we need to know the mole fraction of each component. hexane cyclohexane hexane total 0.25 mol 0.28 0.25 mol 0.65 mol 1 0.72 (0.28 151Torr) (0.72 98 Torr) 113 Torr x x x P = = + = = = × + × = The vapor phase composition will be given by hexane hexane in vapor phase total cyclohexane in vapor phrase 0.28 151Torr 0.37 113 Torr 1 0.37 0.63 P x P x × = = = = = The vapor is richer in the more volatile cyclohexane, as expected. (b) The procedure is the same as in (a) but the number of moles of each component must be calculated first:
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Unformatted text preview: component must be calculated first: hexane 1 cyclohexane 1 hexane cyclohexane hexane total 10.0 g 0.116 86.18 g mol 10.0 g 0.119 84.16 g mol 0.116 mol 0.494 0.116 mol 0.119 mol 1 0.506 (0.494 151Torr) (0.506 98 Torr) 124 Torr n n x x x P − − = = ⋅ = = ⋅ = = + = − = = × + × = The vapor phase composition will be given by hexane hexane in vapor phase total cyclohexane in vapor phase 0.494 151Torr 0.602 124 Torr 1 0.602 0.398 P x P x × = = = = − =...
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